The Peoples of Middle-earth, HoME Vol 12, Part 1, Ch 7, The Heirs of Elendil: The Southern Line of Gondor: The Anárioni

Valakar 1 was a vigorous king, and his son Eldakar 1 was a man of great stature, handsome and valiant, and showed no sign of ageing more swiftly than his father. Nonetheless the disaffection steadily grew during his reign; and when he grew old there was already open rebellion in the southern provinces.

The Peoples of Middle-earth, HoME Vol 12, Part 1, Ch 9, The Making of Appendix A: The Realms in Exile